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Up: THE BENCH SPECTROGRAPH
A rear slit viewing TV (called the Acquisition TV or ATV) for viewing the fiber ends is located immediately after the last filter slot.
A bank of LED's called the Fiber Back Illuminator (FBI) is attached to the ATV assembly and is used to back light the fibers while viewing them with the Hydra Gripper TV. When not in use, the FBI is turned off and located off-axis from the ATV.
Both the ATV and FBI are removed from the spectrograph beam when not in use.